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  Smart fuel consumption 15 Jan 2010 (Ask HJ)
  I wonder if you can give me some advice, last April I purchased a new Smart ForTwo CDi, primarily based on its published fuel economy of 85.6mpg, or 621...
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  Stop start economy 11 Jul 2009 (Ask HJ)
  I have an excellent Volvo 480 but it is 15 years old, and I am thinking of buying under the "scrappage" scheme a new "Volvo C30 DRIVe". However, advertising...
• BMW 5-Series E34 (1987 - 1996) - 91 3.5 Won't start. 28 May 2009 (Forum)
  -Battery-OK(brand new) -Checked all Fuses-OK -Checked Ignition coil(new MSD coil) plenty of spark. -Checked Fuel pump-OK -Checked Fuel Pump Relay. No ground, but when I jump ground to a nearby suspension bolt, fuel pump fires right up, so PUMP is OK. -Relay told pump to turn on, so RELAY is OK -Checked CrankShaft Position Sensor-not sure how to test, but also less than 6 months old and appears fine.
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  Is it cheaper to charge a PHEV at a commercial charge point or using the petrol engine? 12 Mar 2024 (Ask HJ)
  I own a Ford Kuga Titanium PHEV. Is it cheaper to charge the battery at a commercial charge point or by charging it using the petrol engine?
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  Should I use premium fuel in my Honda Jazz Hybrid? 15 Aug 2022 (Ask HJ)
  After many Honda Civics that never went wrong, the new one is too big now so I am getting a Honda Jazz EX to mimic the "glide silence" of my Honda E for...
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  Why do you advise keeping a car's air con switched on? 21 Feb 2022 (Ask HJ)
  You recently advised that the best way to keep your car's air con healthy is to keep it switched on. I think that's bad advice as it uses up to 10 per...
• BMW 320D Tourer E46 Diesel 2002 reg - Crank but no start. 14 Jul 2021 (Forum)
  I then replaced the fuel filter under the car (passenger side), and still no start, but did notice that now the diesel fuel pump next to it is always priming every time you attempt to start the car, so replaced that and still no start but still constantly priming.
• Nissan Primera P11 2.0 TD SX - Nissan Primera P11 2.0 TD Fuel Pump Relay and Fuse 1 Dec 2014 (Forum)
  I get 13.8 volts at the pump harness connector with the car running so that looks ok and the fuel gauge works. The voltage does not drop after a few seconds which I would expect. What is strange is I still get that voltage when I pull the fuel pump fuse? can that be explained? I pulled the fuse according to the fuse box layout diagram.
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  Will a diesel Volkswagen Golf be more economical than the petrol version? 16 Mar 2013 (Ask HJ)
  New Golf 1.4TSI petrol or new 1.6TDI diesel? I’ve done the maths. For both cars after three years at 8000 miles per year at urban mpg (43 petrol and 62...
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  Vauxhall contribution to fuel pump repair 10 Jan 2013 (Ask HJ)
  I have a 56 plate Vauxhall Zafira 2.2 Direct. Engine warning light came on and the car just stopped and would only do 5mph. Scary as I had just left dual...
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  Should I switch to diesel, now my annual mileage has doubled? 5 Nov 2012 (Ask HJ)
  My commute has recently become longer, and as a result my annual mileage has changed from 10,000 to 20,000 miles. I currently have a 06-plate Volkswagen...
• VW Passat 1997 TDi 110bhp - VW TDi revs on hot start and no power 11 Mar 2011 (Forum)
  Back to garage on diagnostics. Solenoid valve on fuel pump showed issue so took it to a diesel fuel injection specialist. On diagnostics again, fuel solenoid came up, he put in a new air mass meter and swapped the solenoid with another one (not new) faults cleared in ecu.
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  Is it credible that the new Mercedes-Benz CKS 350 petrol returns 40mpg? 5 Mar 2011 (Ask HJ)
  I was surprised by the fuel consumption claim of 40mpg combined for the new Mercedes-Benz CLS 350 petrol model. I think the old model 320CDI was 36mpg...
• Mazda 6 - Fuel pump causing problems 12 Dec 2010 (Forum)
  Second garage the car was put on a diagnostic machine which came out with a long list of POSSIBLE problems, nothing definite so decided to change the crankshaft sensor and timing belt, still the car will not start.  Then it was decided, by yet another recomended garage it was the fuel pump which had gone so after the fuel pump had been changed it was still not starting. Now the garage then advised me it could possibly that the fuel pump was not starting because Mazda cars needed a special type of code for parts to work.
• If you have an S-Max.... 25 Apr 2007 (Forum)
  However, if you have an S-max despite what Ford UK and Ford ETIS says the S-Max does not have a 'usaeble' 70 litre fuel tank. From my last two tanks I have got 62.28 litres and 63.54 litres in the tank. On both occoasions, the fuel computer claimed I had about 10 miles left in the tank. Therefore from these tanks, I worked out that if I have a 70 litre tank as Ford state, when the fuel computer says I have zero miles left, I should actually have about 1 gallon left in the tank.
• Cars with automatic gearboxes - ...fuel costs up, time to teach 'pulse and glide'? 18 Jul 2021 (Forum)
   The technique pulse and glide was born during WORLD WAR II when the greatest effective method in a war is to ambush fuel and ration supply convoys i.e trucks that was sent to refuel tanks,armored vehicles and troop transport vehicles. Soldiers improvised and learned to use techniques the lead to fuel rationing and effectively increasing the Mpg's.
• Ford Focus - Rattling noise 28 Aug 2015 (Forum)
  It only ever does this when warm and the hotter the weather the worse it is (it hardly does it at all in the rain)   The only things I am now left with is low fuel pressure although this doesn’t explain why it only does it when hot and the downstream (post-cat) lambda but I didn’t think this affected fuelling, I thought it was purely there to monitor the cats efficiency?
• Nissan Serena - Problems with diesel fuel system 21 Feb 2014 (Forum)
  I now believe that although the vehicle was in good order until it broke down when, attempting to re start after fitting the replacement head failed miserably. It was wanting to go but was clearly not getting fuel. Help was sought and eventually after much checking of fuses, supply, and imobilser etc, fuel was eventually delivered to the injectors and the engine now starts and runs well. But alas the spill line is being pressurised fron the pump body connection.
• Nissan Serena - Problems with diesel fuel system 11 Feb 2014 (Forum)
  I now believe that although the vehicle was in good order until it broke down when, attempting to re start after fitting the replacement head failed miserably. It was wanting to go but was clearly not getting fuel. Help was sought and eventually after much checking of fuses, supply, and imobilser etc, fuel was eventually delivered to the injectors and the engine now starts and runs well. But alas the spill line is being pressurised fron the pump body connection.
• 2003 Focus 1.8 TDCI - FRP Sensor change 21 Oct 2011 (Forum)
  P190 - Fuel rail pressure out of expected range - Ford changed the Fuel metering valve, only difference was me £300 light. Voltage test at Fuel Rail Pressure sensor showed 5V supply, but 4.63V at the output signal, I thought this was meant to be around 1.5V at cranking before the PCM would allow the injectors to fire as to prevent damage occuring.